package com.sky.service.impl;

import com.alibaba.fastjson.JSON;
import com.alibaba.fastjson.JSONObject;
import com.google.gson.JsonObject;
import com.sky.constant.MessageConstant;
import com.sky.dto.UserLoginDTO;
import com.sky.entity.User;
import com.sky.exception.LoginFailedException;
import com.sky.mapper.UserMapper;
import com.sky.properties.WeChatProperties;
import com.sky.service.UserService;
import com.sky.utils.HttpClientUtil;
import io.swagger.util.Json;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Service;

import java.time.LocalDateTime;
import java.util.HashMap;
import java.util.Map;

@Service
public class UserServiceImpl implements UserService {
    @Autowired
    private WeChatProperties weChatProperties;
    @Autowired
    private UserMapper userMapper;
    private static String WX_Login = "http://api.weixin.qq.com/sns/jscode2session";

    /**
     * 微信登录
     * @param userLoginDTO
     * @return
     */
    public User wxLogin(UserLoginDTO userLoginDTO) {
        //获取openid
        String openid = getOpenid( userLoginDTO.getCode() );
        //判断openid是否为空，假如为空表示业务出现异常
        if(openid == null) {
            throw new LoginFailedException( MessageConstant.LOGIN_FAILED );
        }
        //判断是否是新用户，新用户则注册
        User user = userMapper.getByOpenid(openid);
        if(user == null) {
            user = User.builder().openid( openid ).createTime( LocalDateTime.now() ).build();
            userMapper.insert(user);
        }
        return user;
    }
    /**
     * 通过微信接口服务获取openid
     */
    private String getOpenid(String code) {
        Map<String, String> map = new HashMap<>();
        map.put( "appid", weChatProperties.getAppid());
        map.put( "secret",weChatProperties.getSecret() );
        map.put( "js_code",code );
        map.put( "grant_type","authorization_code" );
        String json = HttpClientUtil.doGet( WX_Login, map );

        //JSON.parseObject()转化为java对象，调用get方法得到openid
        JSONObject jsonObject = JSON.parseObject(json);
        String  openid = jsonObject.getString( "openid" );
        return openid;
    }
}
